喷雾干燥法制备PS-PVD用8YSZ纳米团聚粉末  

8YSZ Nano Agglomeration Powder Prepared by Spray-drying for PS-PVD

作　　者：殷建安 刘敏 张小锋 邓春明 邓子谦 曾德长[1] YIN Jian-an;LIU Min;ZHANG Xiao-feng;DENG Chun-ming;DENG Zi-qian;ZENG De-chang(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangzhou 510651,China;Key Lab of Guangdong for Modern Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510651,China)

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]广东省新材料研究所现代材料表面工程技术国家工程实验室,广州510651 [3]广东省新材料研究所广东省现代表面工程技术重点实验室,广州510651

出　　处：《表面技术》2018年第10期275-282,共8页Surface Technology

基　　金：广东省自然基金团队项目(2016A030312015)；广东省科技计划项目(2017B090916002)；广州市科技计划(201707010385；2014B070706026)。

摘　　要：目的通过喷雾干燥法制备用于等离子喷涂-物理气相沉积法(Plasma Spray-Physical Vapor Deposition,PS-PVD)多相沉积柱状/致密涂层的Zr O_2-8%Y_2O_3(8YSZ)纳米团聚粉末。方法采用平均粒度为20 nm的8YSZ纳米粉为原料并配制成浆料,球磨后通过喷雾干燥法制备出8YSZ的纳米团聚粉末,并研究不同含量粘结剂(NJ-3)对粉末的影响。利用TEM、SEM表征粉末及涂层的微观结构。通过XRD、激光粒度及拉伸试验对粉末及涂层性能进行表征。结果纳米8YSZ粉末在添加适当种类及含量的分散剂、粘结剂并通过喷雾干燥加工后,成功制备出球形度高、粒度小且适用于气/液/固多相沉积的PS-PVD用喷涂粉末。当粘结剂含量低于8%时,粉末球形度低,表面存在明显坑孔。而当粘结剂含量高于12%时,PS-PVD气相沉积效率低,涂层质量差。当粘结剂含量为10%时,粉末球形度高,D90=12.24μm,可气/液/固多相沉积制备形貌良好的柱状涂层及致密涂层。其中气相沉积所制备柱状涂层结合强度可达33 MPa,且原始粉末中的m-ZrO_2完全转变为t-ZrO_2。结论当粘结剂含量为10%时,所制备粉末能够流畅送粉,并进行气/液/固多相沉积,且涂层质量最优。粘结剂在粉末内部分布均匀,并主要起粘结和支撑作用,同时可改善粉末表面形貌。喷雾干燥后粉末粒度随着粘结剂含量增加而增大,但非线性变化。The work aims to prepare ZrO2-8%Y2O3(8YSZ)nano-agglomeration powders for Plasma Spray-Physical Vapor Deposition(PS-PVD)multiphase deposition columnar or dense coating by spray drying method.The 8YSZ nano powders with an average particle size of 20 nm was used as raw material to prepare slurry.The 8YSZ nano-agglomeration powders was prepared by spray drying after ball milling,and the effect of binders(NJ-3)with different contents on the powder was studied.The microstructures of powders and coatings were characterized by TEM and SEM;and the properties of powders and coatings were characterized by XRD,laser particle size and tensile test.The 8YSZ nano-agglomeration powders could be prepared to the spraying powder with high sphericity and small particle size and suitable for PS-PVD multiphase deposition of gas/liquid and solid after being added with dispersant and binder of appropriate types and contents.When the binder content was less than 8%,the sphericity of the powder was low,and there were apparent pit holes on the surface.When the binder content was higher than 12%,the PS-PVD vapor deposition efficiency was low,and the coating quality was poor.When the binder content was 10%,the sphericity of the powder was high(D90=12.24μm)and multiphase deposition of gas/liquid/solid could be prepared to columnar coating and dense coating with good morphology.The binding strength of columnar coating prepared by vapor deposition reached 33 MPa and m-ZrO2 in the original powder was completely converted to t-ZrO2.When the binder content is 10%,the prepared powder can be fed smoothly,subjected to gas/liquid/solid multiphase deposition and formed to the coating with the best quality.The binder is evenly distributed within the powder and acts primarily as a bond and support and changes the surface morphology of powder.With the increase of binder content,the particle size of the powder after spray drying tends to increase,but changes nonlinearly.

关 键 词：喷雾干燥 等离子-物理气相沉积 8YSZ 纳米团聚 柱状涂层 致密涂层 多相沉积 

分 类 号：TG174.44[金属学及工艺—金属表面处理]